David g



Vcase B, so essentia in heating.

iui'tcd" (t-stre @anni @Wire Letters Patent No. 98,767, lated January `11, 1870.

Y GAS HEATER.

- The Schedule referred to in these Letters Patent and making 'part o the same To all whom. it may concern:

Beit known that I4, DAVID G. HASKINS, of Gambridge, county ot' Middlesex, and State of Massachusetts, have invented a Clay Gas Heater; and l do hereby declare the following Vto be a' full, clear, and exact description thereof, reference being had to the accompanying drawings, in Which- Figure 1 represents my'improved-gas-heater, in perspective;

4Figure 2 is a vertical section of-thesame; and

Figures 3 and 4 show modifications of the same.

My invention has for its object the' utilizing of gas for the production of heat for laboratory, mechanical, culinary, and house-warming purposes; and

It consists in a chamber made of baked earth or clay, covered at the top, with openings at or near'the bottom for the admission of both air and gas', and with perforations or slots in the top, and on one or both sides, for the escape of the mingled gas and air, -together with au opening for the air to pass'through the midst of the chamber without mingling withthe gas until it has issued (burning) through the jperforations or slots in the top and sides, where it has the effect to snpport combustion.

Inthe drawingsv A is the outer case, and, for convenience, has the form of a wine-glass, the base being provided with draught-holes c a, and the neck with holes b b and gas-inlet c. i

The' inner case B is placed within A, is provided with perfor-ations d d, as shown, has tube-like extension e to base of outer case, and is a continuance of' space in base, so that the draughts a a and space inside of hemispherical case Bare connected, but there is no connection between tube e-and spaceg, between inner and outer cases, which is closed Vat top/rn and bottom on. i

The passages through a and tube cto inside of case furnish draught for purposes of combustion.

'Gas is taken in through c, fills space g, and is ig nited inside'inner case B, through the perforations d. Airis received to mingle with thegas and aid its com bustion through draughts b b. 'lhis process gives a blue flame, co'min through the perforated space of The surface of the caseB may be corrugated either vertically or horizontally, both for the purpose of presenting more surface and for the tendency when vertically to increase draught. v

The perforations d d may be slotsiustead of round holes, and may be contained in outside case instead of.

inside case, vbut the action would be the same.'

The shape of the heater is not essential, as shown, for it maybe cylindrical or at, but so long as the rela- `tive construction is preserved the result is` the same.

The holes Z b may be omitted, if desired, or when the perforations are so small and so numerous that the gas becomes sufficiently miugledavith the air in its `escape through them'.

By covering the heater with a dome, as shown in g. 4, a'most intense heat may be'obtained, useful in laboratories, while the simple form shown can be used for heating articles in ordinary kettles.

The size of my heater can be varied greatly, from a large size for use in laboratories, and for culinary andl heatiugfpurposes, to ahcater for gas-burners, and-for this last use it is particularly adapted, for the ame does not jump down to the gas-entrance, as in some of the heaters employed.

- I make my heater ot' clay, for the reason that clayV will retain the heat much longer than metal, while the heat givenout by a clay conductive is much milder and more pleasing than by a metal conductive. Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent, is-- l. 'The combination of perforated'inner case'B with outer case A, substantially as herein s'et forth. 2, The combination of draughtsgct a with tube c,

perforated inner case B, and outer case A, as herein described.

3. The4 combination of draughts b b, gas-inductive c, and space g', substantially as specified.

4. 'The combination of lthe'last-named combination4 with cases A and'B, tube e, and draughts a a, substantially asset forth.

-In testimony whereof, I have signed my name to this specification, in the presence of two subscribingA witnesses. DAVID Gr.l HASKIN S.

Witnesses:

vCARROLL D. WRIGHT, vClins. F. BeowN. 

